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20-Way AMD / NVIDIA Linux Gaming Benchmarks For The 2018 Holidays

If you are hoping to pick-up a new graphics card during the upcoming holiday sales, here is a 20-way NVIDIA GeForce and AMD Radeon Linux gaming benchmark comparison using a wide assortment of GPUs while using the very newest graphics drivers and a variety of OpenGL/Vulkan titles.

Is there any proper write up somewhere for getting amdgpu with a rx 570 (or similar model) up and running on fedora 29 (28 at worst) ? https://doc.fedora-fr.org/wiki/Carte...pilotes_libres
I've followed that and verified by grub boot entries. amdgpu.ppfeaturemask=0xffffffff amdgpu.dc=1 amdgpu.dpm=1
For some reason my card is stuck on the 300mhz entry. I've used watman-gtk (hence ppfeaturemask) to verify. I haven't tried to apply any wattman settings as I don't want misconfigure anything further. I'm assuming on default values clock gating should work out of the box.

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I was hoping that wasn't going to be the answer. I thought the only issue was a power regression on 4.18 that was fixed in 4.18.13.
Guess I'll just wait for the kernel. Everything is working fine apart from the clockgating.

EDIT: Kernel just appeared. Upgrading now . . .

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OK so 4.19.2 and sure enough clock gating kicks in. Along with some really strange black vertical line corruption that waxes lyrical up and down the screen. the boot time was most impressive tho. i tried with dc=0 and got very different corruption, like ghosting with specles and green and pink blurs. rebooted back into 4.18 for now. :/ tried the Tearfree and vblank_mode (s). Anyone got ideas?

EDIT: I have 3 screens hooked up and i usually turn on vsync (previously nvidia triple buffered)

I use awesomewm these days. lightdm on login. which also exhibits the same problem. will look into the mesa git. but really prefer to wait for fedora if that's the issue. Any ideas what a *good* version is / will be?